Revert "[Spring Cleanup] Remove spring dependency in client authn filter"

components/org.wso2.carbon.identity.oauth.client.authn.filter/pom.xml

@@ -45,6 +45,11 @@
             <groupId>org.wso2.carbon.identity.inbound.auth.oauth2</groupId>
             <artifactId>org.wso2.carbon.identity.oauth</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-web</artifactId>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

components/org.wso2.carbon.identity.oauth.client.authn.filter/src/main/java/org/wso2/carbon/identity/oauth/client/authn/filter/OAuthClientAuthenticatorProxy.java

@@ -30,6 +30,7 @@
 import org.wso2.carbon.identity.oauth.common.OAuth2ErrorCodes;
 import org.wso2.carbon.identity.oauth.common.OAuthConstants;
 import org.wso2.carbon.identity.oauth2.bean.OAuthClientAuthnContext;
+import org.wso2.carbon.identity.oauth2.client.authentication.OAuthClientAuthnService;
 
 import java.util.Arrays;
 import java.util.HashMap;
@@ -50,6 +51,7 @@ public class OAuthClientAuthenticatorProxy extends AbstractPhaseInterceptor<Mess
     private static final String HTTP_REQUEST = "HTTP.REQUEST";
     private static final List<String> PROXY_ENDPOINT_LIST = Arrays.asList("/oauth2/token", "/oauth2/revoke",
             "/oauth2/device_authorize", "/oauth2/ciba", "/oauth2/par", "/oauth2/authorize");
+    private OAuthClientAuthnService oAuthClientAuthnService;
     private static final String SLASH = "/";
 
     public OAuthClientAuthenticatorProxy() {
@@ -58,6 +60,16 @@ public OAuthClientAuthenticatorProxy() {
         super(Phase.PRE_INVOKE);
     }
 
+    public OAuthClientAuthnService getOAuthClientAuthnService() {
+
+        return oAuthClientAuthnService;
+    }
+
+    public void setOAuthClientAuthnService(OAuthClientAuthnService oAuthClientAuthnService) {
+
+        this.oAuthClientAuthnService = oAuthClientAuthnService;
+    }
+
     /**
      * Handles the incoming JAX-RS message for the purpose of OAuth2 client authentication.
      *
@@ -70,8 +82,8 @@ public void handleMessage(Message message) {
         HttpServletRequest request = ((HttpServletRequest) message.get(HTTP_REQUEST));
         if (canHandle(message)) {
             try {
-                OAuthClientAuthnContext oAuthClientAuthnContext = OAuthClientAuthnServiceFactory
-                        .getOAuthClientAuthnService().authenticateClient(request, bodyContentParams);
+                OAuthClientAuthnContext oAuthClientAuthnContext = oAuthClientAuthnService
+                        .authenticateClient(request, bodyContentParams);
                 if (!oAuthClientAuthnContext.isPreviousAuthenticatorEngaged()) {
                     /* If the previous authenticator is not engaged it means that either client authentication
                     flow failed or no supported authenticaiton mechanism was found.If the error details are already

components/org.wso2.carbon.identity.oauth.client.authn.filter/src/main/java/org/wso2/carbon/identity/oauth/client/authn/filter/OAuthClientAuthnServiceFactory.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2019-2024, WSO2 LLC. (http://www.wso2.com).
+ * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
- * WSO2 LLC. licenses this file to you under the Apache License,
+ * WSO2 Inc. licenses this file to you under the Apache License,
  * Version 2.0 (the "License"); you may not use this file except
  * in compliance with the License.
  * You may obtain a copy of the License at
@@ -18,29 +18,37 @@
 
 package org.wso2.carbon.identity.oauth.client.authn.filter;
 
+import org.springframework.beans.factory.config.AbstractFactoryBean;
 import org.wso2.carbon.context.PrivilegedCarbonContext;
 import org.wso2.carbon.identity.oauth2.client.authentication.OAuthClientAuthnService;
 
 /**
- * Factory class to get OAuthClientAuthnService OSGI service.
+ * Factory Beans serves as a factory for creating other beans within the IOC container. This factory bean is used to
+ * instantiate the OAuthClientAuthnService type of object inside the container.
  */
-public class OAuthClientAuthnServiceFactory {
+public class OAuthClientAuthnServiceFactory extends AbstractFactoryBean<OAuthClientAuthnService> {
 
-    private static final OAuthClientAuthnService SERVICE;
+    public OAuthClientAuthnService oAuthClientAuthnService;
 
-    static {
-        OAuthClientAuthnService oAuthClientAuthnService = (OAuthClientAuthnService) PrivilegedCarbonContext
-                .getThreadLocalCarbonContext().getOSGiService(OAuthClientAuthnService.class, null);
 
-        if (oAuthClientAuthnService == null) {
-            throw new IllegalStateException("OAuthClientAuthnService is not available from OSGI context.");
-        }
+    @Override
+    public Class<OAuthClientAuthnService> getObjectType() {
 
-        SERVICE = oAuthClientAuthnService;
+        return OAuthClientAuthnService.class;
     }
 
-    public static OAuthClientAuthnService getOAuthClientAuthnService() {
-
-        return SERVICE;
+    @Override
+    protected OAuthClientAuthnService createInstance() throws Exception {
+
+        if (this.oAuthClientAuthnService != null) {
+            return this.oAuthClientAuthnService;
+        } else {
+            OAuthClientAuthnService oAuthClientAuthnService = (OAuthClientAuthnService) PrivilegedCarbonContext
+                    .getThreadLocalCarbonContext().getOSGiService(OAuthClientAuthnService.class, null);
+            if (oAuthClientAuthnService != null) {
+                this.oAuthClientAuthnService = oAuthClientAuthnService;
+            }
+            return oAuthClientAuthnService;
+        }
     }
 }